66 synonyms for radical such as left-winger, absolute, basic, anti-capitalist, extremist, and fanatic. Radical is an adjective, and its antonyms are moderate and conservative.
Absolute, complete, comprehensive, desperate, draconian, drastic, entire, exhaustive, extensive, far-reaching, forceful, major, profound, rigorous, root-and-branch, serious, severe, stringent, sweeping, thorough, thoroughgoing, total, utter, violent, and wide-ranging.
Basic, constitutive, deep-seated, essential, fundamental, inherent, innate, intrinsic, organic, quintessential, root, and structural.
Anti-capitalist, diehard, extremist, fanatical, left-wing, leftist, militant, progressive, progressivist, reforming, reformist, revisionist, revolutionary, right-on, socialist, and woke.
Diehard, extremist, fanatic, left-winger, leftist, militant, progressive, reformer, revisionist, revolutionary, socialist, and zealot.